Support the PURPLE_PLUGIN_PATH environment variable.  This patch is based on
one from Nixpkgs, but properly handles the case where that variable is unset.

--- pidgin-2.10.11/libpurple/plugin.c.orig	2014-11-23 11:41:25.000000000 -0500
+++ pidgin-2.10.11/libpurple/plugin.c	2015-08-04 14:31:02.257366144 -0400
@@ -1178,8 +1178,19 @@
 void
 purple_plugins_init(void) {
 	void *handle = purple_plugins_get_handle();
+	const gchar *purple_plugin_path;
 
 	purple_plugins_add_search_path(LIBDIR);
+	purple_plugin_path = g_getenv("PURPLE_PLUGIN_PATH");
+	if (purple_plugin_path && *purple_plugin_path) {
+		gchar **paths = g_strsplit(purple_plugin_path, ":", -1);
+		if (paths) {
+			gchar **p;
+			for (p = paths; *p; ++p)
+				if (**p) purple_plugins_add_search_path(*p);
+		}
+		g_strfreev(paths);
+	}
 
 	purple_signal_register(handle, "plugin-load",
 						 purple_marshal_VOID__POINTER,
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<tr><td><span title='2022-12-15 15:22:01 +0100'>2022-12-15</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=7caf07f85195b21fbdc13cbe7a3b78865bd8e287'>gnu: Add ibus-speech-to-text.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ibus.scm (ibus-speech-to-text): New variable.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2022-10-04 20:40:46 +0200'>2022-10-04</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=a96ebe47b0686b5dd7ebe5fc133073abce559f4d'>gnu: ibus: Build with GTK4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ibus.scm (ibus)[arguments]: Add “--enable-gtk4”.
[inputs]: Add gtk and pango-next.
</span></span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-10-04 20:40:45 +0200'>2022-10-04</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=ef53c075a110d960ff4b29229d30d8ed764cffd2'>gnu: Add ibus-minimal.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ibus.scm (ibus-minimal): New variable.
(ibus): Inherit from ibus-minimal.
</span></span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-09-13 00:20:34 -0400'>2022-09-13</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=e631e122e310e0960b959dc5578452f997621a6e'>gnu: ibus: Update to 1.5.27, use gexps and remove input labels.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ibus.scm (ibus): Update to 1.5.27.
[arguments]: Use gexps.
[configure-flags]: Use search-input-file.  Add '--disable-systemd-services'.
[make-flags]: Add the DISABLE_GUI_TEST variable.
[phases]{patch-docbook-xml}: Use this-package-native-input.
{patch-python-target-directories}: Break line.
{fix-paths}: Use format to double quote command.
[inputs, native-inputs]: Delete labels.
[inputs]: Add bash-minimal.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-07-02 01:09:19 +0200'>2022-07-02</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=2533e7f8d151f16cfbc23afa0f262dc7e096ccdf'>gnu: ibus-anthy: Modernize arguments.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ibus.scm (ibus-anthy)[arguments]: Convert to list of
G-Expressions.
</span></span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-07-02 01:05:16 +0200'>2022-07-02</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=421b47624c44cddeb362a5736eef407112c2babe'>gnu: ibus-anthy: Archaize wrapper.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a follow-up to 39b118776bbbaed049f8bcafa27bde30d9d0b2f6, which
applied the wrong modernization metaphors.  For more information, see
&lt;https://issues.guix.gnu.org/52576#16&gt;.

* gnu/packages/ibus.scm (ibus-anthy)[#:phases]&lt;wrap-programs&gt;: Refer to
outputs by assoc-ref.
</span></span></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2022-06-24 10:00:13 -0400'>2022-06-24</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=89db6e7ec77bf0f33474e47945755f5ab45e9f06'>gnu: ibus-anthy: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is in follow up to 39b118776bbbaed049f8bcafa27bde30d9d0b2f6.

* gnu/packages/ibus.scm (ibus-anthy)
[phases]{wrap-programs}: Add missing 'inputs' keyword.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-06-23 22:49:08 -0400'>2022-06-23</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=39b118776bbbaed049f8bcafa27bde30d9d0b2f6'>gnu: ibus-anthy: Modernize.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ibus.scm (ibus-anthy)[phases]: Delete trailing #t and adjust to
use search-input-file and search-input-directory.
[native-inputs]: Use new style.
[inputs]: Likewise.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-06-23 21:40:15 -0400'>2022-06-23</span></td><td><a href='/guix/commit/gnu/packages/ibus.scm?id=2dc43d7d5b50b3ef6ef506dc2572c9cc3beed334'>gnu: ibus-anthy: Update to 1.5.14</a><span class='msg-avail'>...<span class='msg-tooltip'>Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Taiju HIGASHI</td></tr>